Gentoo Archives: gentoo-dev

From: Joakim Tjernlund <joakim.tjernlund@×××××××××.se>
To: "gentoo-dev@l.g.o" <gentoo-dev@l.g.o>
Subject: [gentoo-dev] Impl. egetent in user.eclass using script from sys-apps/getent?
Date: Wed, 10 Jun 2015 16:44:26
Message-Id: 1433954657.10355.175.camel@transmode.se
1 I wonder if it would be possible to use the script from sys-apps/getent(included below)
2 to impl. getent in user.eclass instead of using glibc's getent? I cannot see any downside, is there one?
3
4 This would help a lot(just seed your groups/users is in ROOT/etc/{passwd,group ...} first)
5 when cross building or ROOT != / as it would be trivial for the script to respect ROOT/EPREFIX
6
7 sys-apps/getent:
8 #!/bin/sh
9 #
10 # Closely (not perfectly) emulate the behavior of glibc's getent utility
11 #
12 #passwd|shadow|group|aliases|hosts|networks|ethers|netgroup|protocols|services|rpc
13 # only returns the first match (by design)
14 # dns based search is not supported (hosts,networks)
15 # case-insensitive matches not supported (ethers; others?)
16 # may return false-positives (hosts,protocols,rpc,services,ethers)
17
18 [ -z "$PATH" ] && PATH="/bin:/usr/bin" || PATH="${PATH}:/bin:/usr/bin" export PATH
19
20 file="/etc/$1"
21 case $1 in
22 passwd|group)
23 match="^$2:\|^[^:]*:[^:]*:$2:" ;;
24 shadow)
25 match="^$2:" ;;
26 networks|netgroup)
27 match="^[[:space:]]*$2\>" ;;
28 hosts|protocols|rpc|services|ethers)
29 match="\<$2\>" ;;
30 aliases)
31 match="^[[:space:]]*$2[[:space:]]*:" ;;
32 ""|-h|--help)
33 echo "USAGE: $0 database [key]"
34 exit 0 ;;
35 *)
36 echo "$0: Unknown database: $1" 1>&2
37 exit 1 ;;
38 esac
39
40 if [ ! -f "$file" ] ; then
41 echo "$0: Could not find database file for $1" 1>&2
42 exit 1
43 fi
44
45 if [ $# -eq 1 ] ; then
46 exec cat "$file"
47 else
48 sed "s/#.*//; /$match/q; d" "$file" | grep . || exit 2
49 fi

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